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Reviewed by
Ludis.app Team
Published
May 28, 2026
Updated
May 28, 2026
Planeturex is a mobile exoplanet habitability sandbox that puts real astrophysics in your hands. It sits at the crossroads of science education and open-ended simulation, asking a deceptively simple question: can life survive on the world you build? The app is aimed at curious minds who want more than a passive learning experience — those willing to experiment, fail, and iterate their way to a stable, living planet.
Planeturex frames planet-building as a continuous feedback loop rather than a one-time creative act. You set parameters — orbital distance, star type, atmospheric gas ratios, eccentricity, planetary structure — and the system immediately recalculates temperature, radiation levels, and water stability. Nudge CO2 upward and watch the greenhouse effect climb; pull the orbit outward and surface water freezes solid. Nothing is consequence-free.
The app tracks progress through an XP and milestone system — completing a planet creation step awards points, and a user rank (such as "Architect" at level 3) reflects cumulative engagement. Constrained challenge modes push you to hit specific habitability targets under restricted conditions, which forces genuine understanding of how each variable interacts rather than random trial and error. You can also save and compare multiple planet builds side by side to isolate what actually shifts the life score.
The life score topping out at 100 and the step-by-step wizard structure give the app an approachable shape, but veteran users may find the parameter ceiling limits how extreme or exotic their configurations can become.
The visual language leans into deep blues, golden yellows, and bright orange — the same palette that shows up in space-themed and deep-water environments alike. Sliders are large and clearly labeled with numerical readouts in scientific units (°C, atm, AU, g), and preset buttons offer shortcuts when you want to explore a known baseline quickly. The atmosphere builder uses a segmented progress bar across seven steps, so you always know where you are in the creation flow. Metric and imperial unit switching is available in settings. The color-coded gas sliders — purple for CO2, green for oxygen, yellow-orange for nitrogen — make the atmosphere screen particularly easy to scan at a glance, which shares a certain visual rhythm with games that use color-coded reels and symbols to communicate state instantly. In both cases, reading the board is half the skill.
| Category | Educational / Simulation |
| Planet Editor Tabs | Orbit, Structure, Atmosphere, Water |
| Planet Creation Wizard | 7-step guided process |
| Adjustable Atmosphere Gases | CO2, Oxygen, Nitrogen |
| Star Types | Red Dwarf, Sun-Like, Blue Giant |
| Tracked Planet Parameters | Temperature, pressure, gravity, water state, life score (0–100) |
| Atmosphere Presets | Earth-like, Thin Nitrogen, CO2-rich, Vacuum |
| Measurement Units | Metric and Imperial |
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Planeturex ist eine App, bei der man sich zunächst fragen könnte: Brauche ich wirklich eine Simulation, in der ich Planeten baue und deren Bewohnbarkeit teste — ist das überhaupt mehr als ein netter Zeitvertreib? Ich habe die App eine Weile intensiv genutzt und muss sagen, dass der erste Eindruck täuscht, …
8 replies
Thorsten_K: Ein Mittelding, das gut funktioniert, aber seinen Platz noch sucht.
iPhone 14, iOS 17.4. Genau das ist das Problem. Zu viel Mittelmaß. Entweder richtig Sim oder richtig casual — so bleibt es irgendwo dazwischen hängen.
Thorsten_K: Für wirklich wissenschaftlich Interessierte fehlen dagegen womöglich die Tiefe und die Quellenangaben
Ehrlich gesagt sehe ich das etwas anders. Ich habe die App vor allem wegen des Atmosphären-Editors ausprobiert, und der hat mich länger beschäftigt als erwartet. Dass CO2 den Treibhauseffekt beeinflusst und man das direkt am Life-Score ablesen kann — das ist für eine kostenlose Sandbox-App schon beachtlich. Klar, Tooltips fehlen an einigen Stellen, aber das Grundprinzip erschließt sich schneller als gedacht. Mal konkret: Wer zehn Minuten investiert und einfach anfängt zu schrauben, versteht das System intuitiv. Kein Meisterwerk — aber für Neugierige ein überraschend solider Einstieg.
Thorsten_K: Mal abwarten, ob zukünftige Updates das Angebot schärfen.
Die Frage, die mich beschäftigt: Was bekomme ich hier für meinen Zeitaufwand? Das XP-System und die Meilensteine klingen motivierend, aber wenn es nach Level 3 kaum neue Herausforderungen gibt, ist das Progression-System dann wirklich durchdacht oder nur Fassade? Ich vergleiche das gerne mit anderen Simulations-Apps, die ähnliche Konzepte haben, aber deutlich mehr Tiefe in den Langzeit-Simulationen bieten. Planeturex macht vieles richtig — der Orbit-Editor ist übersichtlich, die Live-Vorschau funktioniert — aber der Wert steht und fällt damit, ob regelmäßig neue Challenges oder Szenarien hinzukommen.
Planeturex surprised me — on one hand, it's a legitimately well-thought-out planet-building simulator that actually rewards careful thinking over random guessing, and on the other hand it can feel oddly punishing when you're just starting out and have no real sense of which parameters matter most. The orbit and atmosphere …
7 replies
tara_m: the jump in difficulty feels abrupt — you go from freeform sandbox to 'figure out exactly why your planet is freezing' with not much scaffolding in between
Oh man, okay so I had almost the exact same experience with the challenge mode and I just want to say — the difficulty cliff is real, like genuinely jarring, and I think the issue is that the freeform sandbox is so forgiving and fun and exploratory that when you hit the constrained challenges it feels like a completely different app, and the game never really prepares you for that shift, which is frustrating because the underlying science is so cool and I genuinely want to engage with it more deeply, I just wish there were a few stepping-stone challenges between 'do whatever you want' and 'now optimize for life score under these strict conditions', also the atmosphere builder is honestly one of the best interfaces I've used in any simulation app on mobile — the way it shows you live temperature feedback while you slide the CO2 bar is so intuitive and tactile, I kept adjusting it way past what I needed just because it felt good to use.
pixelRonan: the atmosphere builder is honestly one of the best interfaces I've used in any simulation app on mobile
yeah the atmosphere builder is the best part tbh spent like twenty minutes just watching the temperature number change. honestly didn't even care about the life score for a while
tara_m: whether the content depth actually scales with that progression, or whether you hit a ceiling fairly quickly
I have been using Planeturex for some weeks now, and I think the concern about depth is worth examining carefully. The app, as it currently stands, does offer a reasonably substantive experience in the early and mid stages of planet building; the orbital mechanics, the atmospheric composition tools, and the structural parameters all interact in ways that feel genuinely educational rather than merely cosmetic. That said, I do notice that the challenge scenarios — which used to feel quite varied in their constraints during the first few weeks after I installed the app — now seem to repeat certain patterns with some regularity. Whether that is a matter of the content pool being limited or simply my having internalized the core logic of the system, I cannot say with certainty. The XP and milestone progression is well-implemented and I appreciate that it does not feel artificially inflated; however, I would welcome a more explicit curriculum of sorts, something that builds systematically on each concept before introducing the next variable into the mix.
